Speaking of celebrity exercise workouts, who do you suppose Michelle Pfeiffer turned to when she had to squeeze into that skin-tight, black Catwoman costume in "Batman Returns" ?

The answer is Kathy Kaehler, a personal fitness trainer who caters to Hollywood stars. She makes big-name celebrities sweat, and helps whip them into shape for their starring roles.

Kathy helped Melanie Griffith develop her "bod for sin" in "Working Girl," and when Penelope Ann Miller wanted to play a stripper in "Carlito's Way," Kathy had only three weeks to tone her up for the bare-it-all audition.

Her other famous clients include Meg Ryan, Rob Lowe, Farrah Fawcett, Candice Bergen, Sarah Jessica Parker, Ellen DeGeneres, Jennifer Aniston, Winona Ryder, Bonnie Raitt, Claudia Schiffer, Julianne Phillips, Sugar Ray Leonard, Justine Bateman Lisa Kudrow, and Samuel L. Jackson.